Filter.



UNITED STATES PATENT OFFICE.

JOHN C. HENDERSON, OF NEW YORK, N. ASSIGNOR TO THE MAIZE PRODUCTSCOMPANY, OF SAME PLACE.

FILTER.

SPECIFICATION forming part of Letters Patent N o. 664,408, datedDecember 25, 1900. Application filed May 4., 1900. Serial No. 15,516.(No specimens.)

To all whom t may concern: i

Be it known that I, JOHN C. HENDERSON, a citizen of the United States,residing at New York, in the county of New York and State of NewYork,have invented certain new and useful Improvements in Filters; `andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as Will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to an improved composition of matter for use infilters or filtering apparatus; and some of the objects of the inventionare to produce a composition of" matter which will remove the foreignoreX- traneous matter from the material treated in the best or mostsatisfactory manner and to produce such a composition which will besimple and cheap. Y

With these and other objects in view the invention consists,essentially, in the elements combined substantially as hereinafter setforth.

The drawing illustrates alternate layers A and B, respectively,offullers earth and sand.

My composition for filters consists of the followingingredients,combined in the following proportions, to wit: fullersearth, comprising solely one layer or stratum, and sand, comprisingsolely one layer or stratum. The layers or strata are preferablyarranged in any suitable filter or filtering apparatus in alternatelayers, first, beginning at the bottom Awith a stratum of sand; second,a layer of ful- 1ers earth; third, a layer of sand; fourth, a layer offullers earth,l and so On until the necessary number of layers has beenprovided. By this composition of matter a filtering material is produceddesigned to decolorize and render limpid the material treated by reasonof the particular properties possessed by the elements of thecomposition.

If desired, in practice aluminium may be substituted for fullers earth,and the fullers earth and sand are used substantially in equal parts orproportions.

I do not desire to limit myself specifically to the proportions of theingredients herein set forth, as the same maybe varied in practicewithout departing from the spirit and scope of my invention.

What I claim is l. A filtering composition embodying fullers earth andsand in alternate layers or strata.

2. A filtering composition consisting of alternate layers or strata offullers earth and sand in substantially equal proportions.

In testimony whereof I have hereunto affixed my signature in presence oftwo witnesses.

JOHN o. HENDERSON.

Witnesses JOHN J. ROSE, DOUGLAss D. MACDONALD.

